Collaborative Research: Peripheral East Antarctic Ice as a Unique Recorder of Climate Variability during the Last Interglacial

合作研究：南极东部外围冰作为末次间冰期气候变化的独特记录者

• 批准号: 2035637
• 负责人: Clay Tabor
• 金额: $ 28.94万
• 依托单位: University of Connecticut
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-08-15 至 2024-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2035637&HistoricalAwards=false
• 关键词: Collaborative; Research; Peripheral; East; Antarctic

This award is funded in whole or in part under the American Rescue Plan Act of 2021 (Public Law 117-2).The spatial extent of the West Antarctic Ice Sheet during the last interglacial period (129,000 to 116,000 years ago) is currently unknown, yet this information is fundamental to projections of the future stability of the ice sheet in a warming climate. Paleoclimate records and proxy evidence such as dust can inform on past environmental conditions and ice-sheet coverage. This project will combine new, high-sensitivity geochemical measurements of dust from Antarctic ice collected at Allan Hills with existing water isotope records to document climate and environmental changes through the last interglacial period. These changes will then be compared with Earth-system model simulations of dust and water isotopes to determine past conditions and constrain the sensitivity of the West Antarctic Ice Sheet to warming. The project will test the hypothesis that the uncharacteristically volcanic dust composition observed at another peripheral ice core site at Taylor Glacier during the last interglacial period is related to changes in the spatial extent of the West Antarctic Ice Sheet. This project aims to characterize mineral dust transport during the penultimate glacial-interglacial transition. The team will apply high-precision geochemical techniques to the high-volume, high-resolution ice core drilled at the Allan Hills site in combination with Earth system model simulations to: (1) determine if the volcanic dust signature found in interglacial ice from Taylor Glacier is also found at Allan Hills, (2) determine the likely dust source(s) to this site during the last interglacial, and (3) probe the atmospheric and environmental changes during the last interglacial with a diminished West Antarctic Ice Sheet. The team will develop a suite of measurements on previously drilled ice from Allan Hills, including isotopic compositions of Strontium and Neodymium, trace element concentrations, dust-size distribution, and imaging of ice-core dust to confirm the original signal observed and provide a broader spatial reconstruction of dust transport. In tandem, the team will conduct Earth system modeling with prognostic dust and water-isotope capability to test the sensitivity of dust transport under several plausible ice-sheet and freshwater-flux configurations. By comparing dust reconstruction and model simulations, the team aims to elucidate the driving mechanisms behind dust transport during the last interglacial period.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

该奖项是根据2021年《美国救援计划法》（公法117-2）全部或部分资助的。目前尚不清楚，在上一个冰期期间（129,000至116,000年前），南极冰盖的空间范围（129,000至116,000年前）尚不清楚，但此信息对冰纸未来在温暖气氛中未来稳定性的投影却至关重要。古气候记录和代理证据（例如灰尘）可以告知过去的环境状况和冰原覆盖范围。该项目将结合对在艾伦山（Allan Hills）收集的南极冰的灰尘的新的，高敏化的地球化学测量，并在最后一次冰川期间记录气候和环境变化。 然后，将将这些变化与尘埃和水同位素的地球系统模型模拟进行比较，以确定过去的条件，并将南极冰盖西部的敏感性限制为变暖。该项目将检验以下假设：在最后一次冰川期间，在泰勒冰川的另一个外围冰核位点观察到的非特征的火山灰尘组成与南极冰原西部的空间范围的变化有关。该项目旨在表征倒数第二个冰川间 - 冰川过渡期间的矿物灰尘传输。 该团队将在Allan Hills站点上钻取高量的地球化学技术，并与地球系统模型模拟结合使用：（1）确定在Allan Hills，（2）可能在Allan Hills，（2）中发现了端子（2），在Allan System Model模型结合使用：（1）确定是否在Taylor Glacier中发现了（2）的端子（2）在最后一次冰川间随着西南极冰盖降低的冰川间冰片的环境变化。该团队将对艾伦山（Allan Hills）先前钻的冰层开发一套测量，包括锶和霓虹灯的同位素组合物，痕量元素浓度，灰尘大小分布以及冰核灰尘的成像，以确认观察到的原始信号并提供更广泛的空间粉尘转运空间重构。在同时，该团队将使用预后的灰尘和水 - 同位素能力进行地球系统建模，以测试在几种合理的冰淇淋和淡水液液配置下粉尘传输的敏感性。通过比较尘埃重建和模型模拟，该团队旨在在最后一次冰河间期间阐明尘埃运输背后的驾驶机制。该奖项反映了NSF的法定任务，并认为值得通过基金会的知识分子优点和更广泛的影响来通过评估来获得支持。